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liraira [26]
2 years ago
8

Why is adult stem cell research less controversial than embryonic stem cell research?

Biology
2 answers:
jok3333 [9.3K]2 years ago
7 0

。☆✼★ ━━━━━━━━━━━━━━  ☾

The correct option would be B. consent can be obtained from adult stem cell donors.

The controversy behind the other option is that it is a form of life, but no consent is taken from the actual life. (i know it's phrased weirdly, my bad)

Have A Nice Day ❤  

Stay Brainly! ヅ  

- Ally ✧  

。☆✼★ ━━━━━━━━━━━━━━  ☾

schepotkina [342]2 years ago
3 0

Answer:

Consent can be obtained from adult stem cell donors.

Explanation:

Considered very special cells, stem cells appear in humans even during the embryonic phase, that is, even before birth. As soon as the baby comes into the world, some organs still hold a small portion of stem cells within them, which become responsible for the constant renewal of that specific organ. The extraction of these stem cells has been the subject of controversy for years. This is because many people believe that it is an invasion of the baby's body that does not have the capacity to consent and protect its own organism.

However, some of these stem cells accompany the human being until adulthood (in smaller quantities than the baby) the extraction of these cells in adults is less controversial, because unlike the baby the adult can consent to the manipulation of his organism.

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The CRISPR/Cas9 system can cleave genomic DNA at sequences other than the desired target, a phenomenon referred to as off target
Deffense [45]

Answer:

The minimum length of a sgRNA sequence to avoid off target cleavage by the CRISPR/Cas system in the fly fruit genome is 14 bases

Explanation:

We are trying to use the CRISPR/Cas system to cleavage the genome of the fruit fly (which is 1.4x10^8 bp long). Also we desire the cleavage to be unique. That means we need a target sequence long enough to be able to assume it will only appear once in the genome.

First, we should think that in every position, we can find one out of four different nucleotide (A, C, T, G). So, the probability of getting a sequence of a given length "n" will be (1/4)^n (We are assuming that the probability of finding a nucleotide in the position "i", it's independent of the nucleotide we find in any other position "j").

Also, to know how many times a sequence will appear in a genome (the expected value of occurrence), we must multiply the probability of that sequence to randomly occur by the length of the genome. For our specific example, the number of occurence of a sequence of length "n" is:

nºoccurence=[(1/4)^n]*1.4*10^8

But in this case, what we want is the expected number of times the sequence will appear to be 1, and we want to obtain the length of the target sequence (n).

Given the information above, we know that:

[(1/4)^n]*1.4*10^8 =1

[(1/4)^n]=(1/1.4*10^8)=1.4*10^-8

Then, if we want to calculate n, we can use logarithms and its properties to get:

log[(1/4)^n]=log[1.4*10^-8]

n*log[(1/4)]=log[1.4*10^-8]

n=log[1.4*10^-8]/log[(1/4)] => n=13.29 approximately.

As the sequence needs to have a natural number of elements, <u>we can conclude that using a target sequence of a minimum of 14 bases with the CRISPR/Cas system in the fly fruit genome should be enough to avoid off target cleavage.</u>

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3 years ago
What does the nucleus consist of?
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<h3>NEUTRONS AND PROTONS</h3>

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How does the following sentence contribute to the development of the main idea in the article?
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Answer:

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Explanation:

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Answer: The answers are C, D, and F

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6 0
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Answer:

D) presence of transcription activators or repressors

Explanation:

The reason why this is not post-transcriptional regulation is that activators actually start the process of transcription by binding to specific sites. while on contrary when repressor binds it halt the process.

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